test: added more unit and integration tests

[soumyamahunt]

No description provided.

[codecov]

Codecov Report

Patch coverage: 81.81% and project coverage change: +35.93% 🎉

Comparison is base (670591a) 50.90% compared to head (480b8f1) 86.84%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #6       +/-   ##
===========================================
+ Coverage   50.90%   86.84%   +35.93%     
===========================================
  Files          24       24               
  Lines         770      768        -2     
  Branches      120      120               
===========================================
+ Hits          392      667      +275     
+ Misses        357       97      -260     
+ Partials       21        4       -17     

Files Changed	Coverage Δ
src/installer/verify.ts	100.00% <ø> (+54.54%)	⬆️
src/platform/linux.ts	84.44% <0.00%> (ø)
src/platform/windows.ts	42.85% <0.00%> (ø)
src/platform/xcode.ts	85.95% <0.00%> (ø)
src/installer/xcode.ts	89.39% <66.66%> (+77.27%)	⬆️
src/installer/base.ts	88.63% <100.00%> (+76.63%)	⬆️
src/utils/gpg.ts	100.00% <100.00%> (+85.29%)	⬆️
src/utils/visual_studio.ts	90.69% <100.00%> (+73.19%)	⬆️

... and 4 files with indirect coverage changes

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